Custom column - 3 separate IDs

Hi everyone,

I'm trying to make the most of Calibre by injecting the ASIN into each AZW3 file I have, in order to allow me to make use of Goodreads integration etc. in the Kindle app on my Fire HD 6.

Though my library is relatively small, manually running through each file's meta data to check the presence (and content) of amazon, asin and mobi-asin tags in the identifiers list, I'm hoping to put this into a custom column to view at a glance, effectively searching for all three tags. If more than one tag exists, enumerate them with the spacer ",".

So for example, if a file contains the following in IDs:

The column would output 'bar'. If the IDs field looks as follows:

The field would output 'bar,xyzzy'.

I hope this makes sense. Any support is appreciated. :thanks: